What is the solution of the system of equations? y = –2x + 5 y = –2x + 20 (0, 20) (1, 3) no solution infinitely many solutions

Solve for Y:  Y =   - 2x  + 5
                     Y  =  - 2x + 20

I will try to solve your system of equation:
Y =  - 2x + 5y;  =  - 2x  + 20

Step: Solve y =  - 2x + 5 for y

Step:
Substitute - 2x + 5 for y in y =  - 2x + 20
                    y =   - 2x + 20
                  - 2x + 5 + 2x =   - 2x + 20 + 2x (add 2x to both sides)

5 = 20
5 +  - 5 = 20 +  - 5 ( add - 5 to both sides)

0 = 15

As you can see, we obtain a false equation. This means that the system as No Solutions.

Thus your answer is: No Solution

Hope that helps!!!